Mega - Secure File Storage and collaboration

Filecamp - Digital Asset Management & Online Proofing tools beautifully integrated, into one secure and cost-effective solution. Manage all your digital marketing assets from your own good-looking, easy-to-use spot in the cloud. Unlimited users in all plans!

Dropbox - Online Sync and File Sharing

Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.

Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...

Nubo - A self-hosted file sharing application in Haskell.